Stove device for automatic choke carburetors



June 20, 1939. M. c BROWN 2,162,934

STOVE DEVICE FOR AUTOMATIC CHOKE CARBURETORS Filed June 25, 1938 [m/en/br #(orns G- Brown Patented June 20, 1939 UNITED STATES STOVE DEVICE FOR AUTOMATIC CHOKE CARBURETORS Morris C. Brown, Detroit, Mich, assignor to Carter Carburetor Corporation, St. Louis, Mo., a corporation of Delaware Application June 23, 1938, Serial No. 215,428

7 Claims.

This invention relates to heat or thermostatic controls for internal combustion engines and consists particularly in novel means for mounting a heating device associated with the control.

A well known form of automatic choke control for internal combustion engine carburetors utilizes a thermostat mounted in a housing adjacent the carburetor air horn and a heater or stove mounted on a part of the engine, preferlO ably the exhaust manifold, which fairly accurately reflects the temperature of the engine firing chambers, this stove being connected to the thermostat housing by a tube through which heated gases are drawn. In mounting the stove devices now in use, the manifold must be drilled, or clamps must be applied. Drilling of the manifold must be accurately done and is generally undesirable. Moreover, in some cases, the manifold construction is such that application of attaching clamps is difficult, and there may be insufficient room to mount a sufficiently large heater.

An object of the present invention is to provide a stove device of the above type which may be attached to the engine exhaust manifold without the necessity of drilling a hole in the manifold or of providing clamps or other holding devices which must extend around the manifold.

Another object is to provide a novel heating device or stove of the above type which may be easily applied and may be repeatedly removed and replaced without avoiding the effectiveness of the stove or its attaching means.

Another object is to provide a high capacity stove or heating device of the above type ar- 35 ranged to be conveniently mounted on a portion of the engine exhaust manifold which would not be easily accessible for the purpose of drilling or applying clamps.

These objects and other more detailed objects hereafter appearing are attained by the device illustrated in the accompanying drawing in which:

Fig. 1 is an inside view showing the intake and exhaust manifolds of an internal combustion engine and a portion of the carburetor, with the heater applied thereto.

Fig. 2 is a top View of the structure in Fig. 1 with the carburetor removed.

Fig. 3 is a vertical transverse section taken substantially on the section line 33 of Fig. 1.

Fig. 4 is a disassembled perspective view showing the novel heater element.

Fig. 5 is a side view showing the heater ele- 55 ment and holding member.

Fig. 6 is a view showing the holding member alone.

The exhaust manifold i and intake manifold 2 are arranged for a six cylinder engine and are provided with the usual branches 3 and 4 hav- 5 ing pads 5 and 6 for attachment to the engine block 1, adjacent the usual valve ports, an intake port being shown at 8 in Fig. 3. The two arms of the exhaust manifold merge at the center in a downwardly extending portion 9 arranged for attachment to an exhaust pipe (not shown) for leading the exhaust gases to the rear of the vehicle. The three branches of the intake manifold meet at the center inside a box construction I0, forming a hot spot and communicating with .1 5 the exhaust manifold to receive hot gases therefrom.

Mounted on hot spot box In is a carburetor H of the automatic choke type, having a housing l2 carried adjacent the upper or air horn portion thereof and enclosing a thermostat 25 for controlling the choke valve. The interior of housing i2 is connected by means of passage 26 to the engine intake suction posterior to the carburetor throttle. An automatic choke construction of this type is disclosed in detail and claimed in Patent No. 2,085,351 issued in the name of I. E. Coffey. Hot air is conducted to thermostat housing [2 by means of an insulated tube l3 extending downwardly from the housing to an angular heater element l4 mounted on a part of the exhaust manifold immediately adjacent the engine block I and beneath and inside hot spot box 10.

The intake and exhaust manifolds are secured to the engine block by means of a series of bolts l5 and washers l6. Extending over the center branch 4 of the intake manifold is a horseshoeshaped holding member I! of laterally resilient material and normally bowed at the center as indicated in Fig. 5. The two center manifold attaching bolts l5 extend through elongated holes or slots I8 in the leg portions of the holding member. At the lower ends of these leg portions are provided inwardly offset lugs or fingers l9 extending into slots 2|] in the stove element. The stove element also has a hole 2| for receiving the lower end of heating tube I3. The bowed construction of holding member I1 is such that when the associated manifold bolts [5 are tightened down thereupon this member is distorted from its normal shape or, in other words, is straightened, which forces the lower ends of the legs of member I! and fingers l9 downwardly and outwardly against heater element l4 so as to hold this element securely in position against' the corner portion 22 of the exhaust manifold.

Stove l4, when assembled, is slightly spaced from the wall of the exhaust manifold at the center, as shown in Fig. 3, whereby an open ended chamber is formed for confining a body of air which is heated by the hot walls of the exhaust manifold. This heated air is drawn trough tube I3 into the thermostat housing [2 and thence into the engine intake, as explained in the above mentioned Cofley patent.

The stove construction is firmly held in position by means of the usual manifold attaching bolts and may be removed and reassembled without avoiding the effectiveness of the stove or holding means. Obviously, the shaping of the stove element l4 may be varied to conform with the particular portion of the exhaust manifold with which it is associated and no special construction of manifolds need be provided, nor need any holes or taps be provided in the manifold to accommodate the heater. The exclusive use of all modifications as come within the scope of the appended claims is contemplated.

I claim:

1. In combination with an internal combustion engine having a thermostatic control, an element forming a heater chamber with a normally hot portion of the engine, means for heating said control from said chamber, and a resilient holding member secured to a part of the engine spaced from said hot portion and extending to said element for securing the same in position.

2. The combination specified in claim 1 fur ther including a device extending transversely of said holding member and connecting the same and said engine, said member being normally bowed whereby lateral pressure thereon from said device causes application of pressure to said heater element to hold said element in position.

3. The combination specified in claim 1 further including a device extending transversely of said holding member and connecting the same and said engine, said member being of normally bowed structure whereby lateral pressure applied to said member by said device causes application of holding pressure to said heater element, said member being resilient to permit removal from and reapplication to an engine without avoiding the effectiveness thereof for holding said heater element in place.

4. In combination with an engine including a manifold and a thermostatic control, a separately formed element forming a heater chamber with a normally hot portion of the engine, a bolt adjacent said portion securing said manifold to the engine block, means for heating said control from said chamber, and a holding member of normally bowed, laterally resilient sheet material secured to the engine by said bolt and bearing against said element to secure the same in position. 7

5. In. combination with an engine having a branched manifold and a thermostatic control, an element forming a heater chamber with a normally hot portion of the engine, means for heating said control from said chamber, a pair of bolts spaced from said portion and securing said manifold to the engine block, and holding structure comprising a pair of normally bowed, laterally resilient members secured to the engine by said bolts and distorted by the pressure thereof so as to bear against said heater element and hold the same in position.

6. The combination as specified in claim in which said holding structure is in the form of a horseshoe extending partially around one of the branches of said manifold.

'7. In combination with an engine having a block, manifold structure, and a thermostatic control, a separately formed element forming a heater chamber with a portion of said structure immediately adjacent said block, said structure extending outwardly from said portion so as to render access thereto difiicult, means for heating said control from said chamber, a sheet member extending along said block and engaging said heater element and a bolt securing said manifold structure and said bowed members to said engine block, said sheet member being normally bowed and being distorted by said bolt so .as to apply holding pressure to said element.

MORRIS C. BROWN. 

